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Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Posted: Tue Oct 09, 2018 10:21 pm
by 8thscale
Donhost4449 wrote:
Thu Oct 04, 2018 12:22 am
As things go, there was a slight bind in the motion. John is studying the rotation to discover the source of the bind.
...
As it turned out, the rear axle quartering was off .009"
Would you please share more information? What was the setup to measure the error?
I've heard of making an offset key. Even if there are no photos any explaination would be appreciated.

Thanks

Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Posted: Wed Oct 10, 2018 3:21 pm
by Kimball McGinley
I have heard it said that reaming Oilite bushing closes off the pores that make them work so well???

Recommended was pushing through a ball the correct size...

Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Posted: Wed Oct 10, 2018 11:06 pm
by Donhost4449
8thscale wrote:
Tue Oct 09, 2018 10:21 pm
Donhost4449 wrote:
Thu Oct 04, 2018 12:22 am
As things go, there was a slight bind in the motion. John is studying the rotation to discover the source of the bind.
...
As it turned out, the rear axle quartering was off .009"
Would you please share more information? What was the setup to measure the error?
I've heard of making an offset key. Even if there are no photos any explaination would be appreciated.

Thanks
I checked with John on this, as he did the work to locate the offending driver. John said "Drivers between centers. Crank pin against chuck jaw. Indicator against other pin. Compare readings."
IMG_1367.JPG
As for the .009" correction, he likely pressed the wheel off, filed the key slightly, and pressed back together. I had a quartering correction that I did on my LE mogul, and that is all that was required to make the correction. You can see the end result here.
IMG_8682.jpg
Chris

Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Posted: Wed Oct 10, 2018 11:15 pm
by Donhost4449
Kimball McGinley wrote:
Wed Oct 10, 2018 3:21 pm
I have heard it said that reaming Oilite bushing closes off the pores that make them work so well???

Recommended was pushing through a ball the correct size...
I've never heard that - maybe it does. However, I don't have a ball that is .505"

This is the same method I used to replace the bearings on my LE mogul in 2015, and that locomotive has run hundreds of miles (actual, not scale) since then with no issue.

Chris

Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Posted: Wed Oct 10, 2018 11:30 pm
by NP317
I reamed the Oilite rod bushings on my Ten Wheeler 15 years ago.
Careful inspection under magnification showed that oil holes survived the reaming process.
Those bushings are still looking new 550 miles later.
~RN

Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Posted: Thu Oct 11, 2018 12:50 pm
by cbrew
using a sharp boring bar would do the job opening up the oilite bearing

Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Posted: Thu Oct 11, 2018 3:16 pm
by rkcarguy
I would say that a dull reamer could roll material into the pores of the oil lite bearing, but a sharp one should cut with no adverse affects.

Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Posted: Mon Feb 18, 2019 12:38 am
by Donhost4449
Wow- time flies! It has been several months since the last update. Progress definitely slowed down: SVLS pumpkin train, Fall Meet, International Railfair, trip to Bitter Creek & Western Railroad, SVLS Santa Train - you get the idea. The first picture is when took our frames out to the club during the pumpkin train for show & tell.
IMG_8654.JPG
John came over to my house in early November and we continued work on the frames, mostly working on the where the cylinders will attach.
IMG_9014-1.JPG
IMG_9019.JPG
My time working on the project through the holidays was almost non-existent. However, John continued to make progress as seen here.
IMG_9581.JPG
IMG_9582 (1).JPG

Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Posted: Mon Feb 18, 2019 12:51 am
by Donhost4449
There was interest expressed earlier with John's method for machining a radius end. Here is a video of John to further illustrate.

https://youtu.be/0elMZsCM-0w

In addition, I put the boiler on the frame to get a look at what we have so far.
IMG_8828.JPG

Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Posted: Tue Feb 19, 2019 8:06 pm
by rwmorris
Whamo! Just like that... Love that technique for machining the radius on the end.

Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Posted: Sun Feb 24, 2019 5:13 pm
by Donhost4449
More catch-up from the holidays - I made these back in October.
IMG_8552.JPG
IMG_8609.JPG
IMG_8611.JPG
IMG_8633.JPG
IMG_8639.JPG

Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Posted: Mon Apr 01, 2019 2:19 am
by comebackshane
Following, great job